The correct answer is: A. public
A public cloud is a type of cloud computing that makes computing resources available to the general public over the Internet. Public clouds are often used by businesses that need to scale their IT resources quickly and easily. However, public clouds are not always the most secure option, as they are open to attack from anyone on the Internet.
A private cloud is a type of cloud computing that is dedicated to a single organization. Private clouds are often used by businesses that need to protect their data and applications from unauthorized access. Private clouds are typically more secure than public clouds, but they can also be more expensive.
A hybrid cloud is a combination of public and private clouds. Hybrid clouds are often used by businesses that need the flexibility of a public cloud, but also need the security of a private cloud. Hybrid clouds can be more complex to manage than public or private clouds, but they can also be more cost-effective.
In conclusion, the public cloud is not trusted in terms of security because it is open to attack from anyone on the Internet.